Air-cooled open-hearth furnace.



H. KNOTH'. AIR COOLED OPEN HEARTE FURNACE.

APPLICATION FILED JUNE 21. 1912.

10045788. Patented Nov, 19, 1912.

2 SHEETS-SHEET l.

D C) C] C] [I] D DOD 89B @253 amen/11oz H. KNOTH.

AIR GOOLED OPEN HEABTH FURNACE.

APPLICATION FILED JUNE 21. 1912.

Patented Nov. 19, 1912 2 SHEBT8-SHEIBT 2.

@Iwueutoz farm A7277 wiiumo ,To all whom-it may concern:

" zen of the United States of i s HENRY KNOTH, F MONTEREY, MEXICO.

AIRv-COOLED OPEN-HEARTH FURNACE.

' Be it known that I, HENRY Kno'rin a citi- America, residlng at Monterey, in the State of Nueva Leon, Mexico, have invented certain new and use- 1 l Improvementsv in Air-Cooled Open- Hearth Furnaces, a specification.

Myinvention relates to a novel, economical and effective means for cooling those portions of the walls and arches of an open hearth steel furnace or other furnace which are most subjected to destruction by the intense heat. Heretofore various attempts have'been made to, cool such'parts of the arrangements have proved unsatisfactory because of the tendency of the water pipes to leakv by becoming eroded or broken under the expansion and contraction of the furnace walls. Since water will quickly destroy the lining of? the furnace frequent repairs are required for such equipments. It is also true that such systems must be kept in service whetherthe condition of the furnace requires it or not, and further no substantial jregulation of the cooling effect is obtainable.

I have conceived the idea ofcooling the ort arches of the furnace, and other points f. desiredyby a novel arrangement of air passages, and the preferred embodiment of my invention comprises the additional ire-- portant feature of arranging these air cool? "ing passages so that the operator can see 3 into them to the point of intensest heat from the furnace floor and can therefore readily note where the most cooling action 1s required.

My invention further comprises means whereby a forced circulation of air may be applied to the transverse coolingpassages, and, by internal connecting passages, may be caused to flow in a circuitous course back and forth through the port arch, plugs being used to close the ends of all but the discharge end of the final passage in the circuit. Such an arrangement is very flexible for. I canuse one blower to create a continuous draft through all the cooling passages, or, where more airis required, I use additional blowers operating through relatively shorter sis passages; or, where the maximum air is required, a single blower. maybe applied to each cooling passage, and all the plugs d1s-'v pinsedwit v. v Myinvention. further comprises the (la;

Specification of Letters Eatent.

Application filed June 21, 1912. Serial No. 705,134.

of which the following is Patented Nov. 19, 1912.

tails of construction and arrangement of parts which are hereinafter more particularly described and claimed, reference being had to the accompanying drawings, in which Figure 1 is a vertical sectional view through one end of the furnace taken on the line D-'D of,Fig. 4. Fig. 2 is a similar sectional view of the other end of the furnace taken on the line EE of Fig. 5. Fig. 3 is a side elevation of the furnace equipped with my invention. Fig. 4 is a horizontal cross-sectional view taken through the air passages on theline B-B of Fig. 6. Fig. 5 is a similar view taken on the line A-A of Fig. 6. Fig. 6 is a vertical cross-sectional view taken on the line CC of Fig. 2.

Similar reference numerals refer to similar. parts throughout the drawings. I have illustrated my invention as especially adapted to cooling the port arches 1 of the ordinary open hearth steel furnace 2 which has at each end an air port 3 and a gas port 4 disposed. centrally under and separated by the arch from the air port. In its simplest form the-air passages 5,6, 7 and 8 are left by the mason after the fashion of checker-work passages when the arch and furnace walls arebeing built and these air passages preferably extend in a straight'line horizontally through the port arch and through the front and rear walls of the furnace so that one may see directly through each passage. Since it is often desirable to protect the side walls of the gas fine 4, I providealso in the brick-work passages 5 6 7 and 8 whichleadinwardly from each side to points adjacent to the side walls of the gas port 4 and then lead upwardly along the side walls of said port and. connect respectively with the flues '5, 6, 7 and 8, which are disposed above them. By this arrangement the cooling air may be applied directly to the bricks which form the top and side walls of the gas port 4 and the bottom walls of the air port 3 which provides the most effective kind of a cooling means.

When the air passages are left open they will, even Without a :forced draft, afford a means of ventilating the port arch which will materially assistiin cooling it. However, I prefer to equip the passages with means for producing a forced draft through them and to this end I use either air or steam which is delivered through a pipe 9 having branch pipes 10 which terminate in nozzles 11 so disposed that each may beturned into position to direct a blast of air or steam tained from a less number of blowers by pro-/ viding internal connecting passages 12, 13

and 14, which are arranged in staggered relation and are disposed within the side walls of the furnace, passage 12. connecting the front ends of the passages 5 and 6, the passage 13, the rear ends of the passages 6 and 7, and the passage 14, the front ends of the passages 57 and 8. I provide plugs 16 which, for convenience, are connected in pairs by iron brackets 17 so that each pair of plugs can be rapidly inserted into the open ends of the adjacent passages 6, 6*; 7,7 ;'and 8, 8. If the plugs'be inserted in. all the open ends of the flues except the front end of the passage'5 and the rear ends of the passages 8, 8*, it will be readily seen that the air forced by the-blower into the passage 5vwill take a clrcuitous course and will be finally discharged through the rear ends of the ports 8, 8 The plugs may be so inserted and the blowers utilized to cause the cooling air to flow once or any desired-number of times transversely through the arch to effectively cool'it.

Where steam is used I have found it desirable to form the outer ends of thepassages 5, 6, 7 and 8, and 5", 6 7 and 8- out of short sections of pipes 18 which extend inwardly only to points adjacent to 3 air and gas portsandan arch which separates said ports, a series of air coolingpasportions of thepassiages which surround the gas'portv f These pipes are disposed atv a slight ang. so that they will drain out the water of condensation and prevent it from being absorbed by the brick-work. When' the .pipes are-used'they may be walled in at little expense in the construction of the furwardly and then transversely and then outwardly as the most satisfactory means of maintaining the brick work at the, rear end of the arch cooled.

Thenumber and relative arrangement ."of. the flues may be varied to suit different-operatingconditions without departing from. the spirit of my invention Also air" or' steam may be blown'through any of the channels by director indirect means and. the improvements herein described are: equally available for other types-.offurnace's j besides open hearth. Where I' refer toiairpassages, it will be understood. toincludethe use of steam, or air and steam mixed, as the cooling medium.

.What I claim as newand desire to secure by Letters Patent, is

1. A cooling system for open hearth steel furnaces comprising in combination with the portarch which separates the air and gas ports, of a series of spaced air passages which extend transversely through the port arch and have their ends left open so that theyare visible from the furnace floor, and

means to control independently the circulation of air through said passages.

2. In an open hearth steel furnace having air and gas ports and a port arch separating said ports, a series of spaced transverse air, 7 passages provided inthe brick-work of the furnace and passing from the front wall through the arch, said passages being left open so that their several interiors may be viewed from the furnace floor, and means to separately control the circulation of'the cooling medium througheach of said passages.

3. In an open hearth steel furnace having air and gas ports and an arch which sepa-, rates said ports, a series of air cooling pas sages which open through the front wall of the furnace vand extend in a straight line through said. arch, fcon'nect-ing "passages which also lead from the frontv and rear walls upwardly atan incline to the side walls of the gas port and then upwardly to connect each withone of, the fir'stmentioned' passages, anda metallic lining insertedl'in the inclined portion of. aid lower passages, substantially a'sfdescribed,

at. In an open hearth, steel furnace having sages which pierce said arch'at spaced intervals and. extend in .a straight line transversely-through the furnace and-have their ends open through the front and rear furnace walls, and an independently controllable blower means disposed in front of each passage and designed to leave the view .into the passage substantially unobstructed, substantially as described.

5. In an'open hearthjsteel furnace having air and gas ports and anarch which separates said ports, a'series of, air cooling pas.- sages which extend through the port arch and open through the front wall of the fur wallsqofthe furnace. and through the port nace, mte'rnalbypass flues connecting said 7 arch, short; passages disposed below said posed opposite one or more of the open ends of said latter passages, and means to-close f the open ends of one or more of said passa es, substantially as described.

An open hearth steel furnace having air and gas ports separated by brick-work arch; the arch and Walls of the furnace be ing provided with a number of cooling passages which extend in a straight line from the front wall of the furnace to and through the port arch, said passageshaving outlets through the furnace walls and there being side passages formedin the side walls of the gas port and opening above into the first mentloned passages, and means to cause the circulation of a cooling medium through said 'first mentioned passages, substantially 7 as described. a

8. In an openhearth steel furnace havin air and gas ports, anarch separating sai ports, aplurality of passages which lead inwardly from the front wall ofthe furnace through the port arch and are connected at ftheil' inner ends and left open at their outer ends, and means to force a circulation of a cooling medium through said passages.

In testimony whereof I aflix my signature in presence of two witnesses.

v HENRY KNOTH. Witnesses:

H. A. BDEHLZER,

W. H. Romans. 

